|   2 cogs on freehub for roadride to trailhead? | jh_on_the_cape
Nov 21, 2002 11:15 AM | | Put 2 SS cogs on a cassette and just switch it? There was a post about using a flip flop to switch gears at the trailhead. I do not have a flip flop, but I was considering just putting a smaller cog on a freehub with spacers and just run it not really lined up on the road cog, then when I get there, undo a steel quick release and manually switch over to the 'offroad' cog (2 gears). I have horizontal fork ends. I know the brakes won't line up in the road cog, so I would just undo the rear brake for the road ride. Is that really dangerous/dumb?
I own a freehub wheel, and right now i use a SS wheel with only one side threaded. I want to do this without buying anything or adding too much unnecessary complication. As it is, I can just ride the 34:18 to the trailhead and get there like 2 minutes later or something...
I was just wondering if anyone out there had any sparks of brilliance.
Hi all. I really prefer riding to a trailhead, rather than driving. There is something really nice about rolling out of the house, and rolling back into the house.
we might have to move soon. Right now I live .25 miles from some nice trails, although somewhat limited in extent. Our prospective new abode is about 3 miles to the 'real' trail system in these parts. Spinning my 34:18 on the road stinks, but I like that on the singletrack. |
| re: 2 cogs on freehub for roadride to trailhead? | scrublover
Nov 21, 2002 11:58 AM | | hey jh, dave form boston here. yeah, leave the 34:18 on the inner side, with the 34 on the middle ring spot. put a 36 on the outer ring spot. and a 16 outside of the 18 in back. get it all spaced the same, and you can use the same length chain. got my commuter set sort of this way. bigger road gear, so i have a couple sram quick link thingies in the chain to break it down if i want to offroad on it. sort of a half-assed ss/cross rig on an old mtb frame. i think acs makes a freewheel with 2 cogs on it, not sure of the sizes, or if it is spaced right to work with a double ring set up up frotn without messing up the chainline. |
| Sure, why not? | GlowBoy
Nov 21, 2002 12:21 PM | | I'd do the two-chainring/two-cog thing. Chance are you won't have to realign your brakes either. And even if you can't use your rear brake ... I wouldn't ride very extensively with only one brake working, but if it's just a few miles to the TH I wouldn't worry about it -- on pavement the front is at least 70% of your braking anyway.
On my 'cross/commuter rig I'm doing exactly what scrublover mentioned, but to a much greater degree. I have mine set up as a PENTA-speed. I'm still experimenting with various ratios, but currently I've got 42/40/28 rings and 16/19/21/32 cogs (the 16t is a DX and the others are Uniglide cogs I just bought from DeeEight). I'll probably knock the middle ring down a tooth eventually for more versatility, but currently I have the following five "singlespeed" gears:
- 42:16 2.6:1 General road and commuting gear.
- 42:19 2.2:1 Pavement riding in hilly areas, or fast cruising on dirt roads.
- 40:19 2.1:1 CX racing and dirt-road cruising.
- 40:21 1.9:1 Trail riding.
- 28:32 0.9:1 That's right, a REAL 24-inch gear! For long or highly technical steep climbs. Usually if a ride had much need for this I'd take the mountain bike, but it's nice to have the option.
- Dan |
| yup....... | JAK
Nov 21, 2002 12:08 PM | | I agree, rollin' outa the garage and back in is supreme(w/out gasoline assistance)! For a nifty and brake friendly 2Speed, run two rings up front. Space the cogs the same distance as the rings and run an equivalent chain length...ie 34X18 & 36X16. I run a similar setup and love it. I know it ain't technically and traditionally a 'SINGLESPEED', but then again labels shmabels. I call my rigs drivetrain the...iSPeed...! |
| thanks, but i meant... | jh_on_the_cape
Nov 21, 2002 12:29 PM | | To use only one ring in the front. I use a bashguard, and it gets bashed. Bashed enough that I used to ruin big rings regularly. Can I do this with just one front ring? |
| Sure, just make sure that.......... | JAK
Nov 21, 2002 12:43 PM | | your mtn. gear is perfectly aligned...the road gear doesn't matter as much. |
| ok... thanks... | jh_on_the_cape
Nov 21, 2002 1:11 PM | | i will probably give that a shot at some point...
I am still waiting for those uniglide cogs from whatshisface. |
| Yeah, what he said | GlowBoy
Nov 21, 2002 4:22 PM | | Sorry if I got off-track there talking about my crazy scheme ...
As YAK said, I'd line up the mountain cog and space the road cog one spot further out. If you're using non-ramped cogs the chain should still stay on, even in the road gear. If the difference between the cogs is 2 teeth, you DO need to make sure you have at least 1/4" of room in your dropouts behind the current position. That's about how far it will move back when you move the chain to the smaller cog. If so, should work fine.
If you're running rim brakes, I think there's a good chance they'll still line up OK with just 1/4" of movement, even with horizontal fork ends. You'll have to try it and see though.
- Dan |
| road-plus-trail gears, that's what I run | club
Nov 21, 2002 7:10 PM | | good on ya for riding to the trails, I do the same. Two ways you can go: Using the horizontals, you can run 2 or 3 rings with the same number of cogs, choosing their teeth so each separate combo has the same total number of teeth, so your chain length comes out the same. without a tensioner, the drivetrain doesn't particularly like cross-chaining, so run the granny ring with the inner cog, outer with outer, etc. With a q/r hub, it's pretty quick to shift. I had a triple going for awhile, road, trail, and climbing gears.
But that frame became my singletrack fixed gear when somebody gave me a yeticuda, er, barraceti, Dos Equis team frame with verticals and a derailleur hanger. so now I use an old derailleur as a tensioner. that makes shifting even easier. I run a 15t road cog and an 18, 19, or 20t for the trail. right now it's a 20, the trails are kinda soft. using a derailleur, you stick a piece of shift cable into the barrel adjuster, with the cable end in the barrel, then hook it up to the cable clamp. then you just turn the barrel adjuster a little to shift cogs. with a tensioner or derailleur you don't need a perfect chainline, so you can also run 2 rings up from, both from the trail cog with no problem. I got 24 and 36 going on. So you got two trail gears plus and overdrive for the road. you could even do a triple up front and more in back, but at some point you're just reinventing the derailleur bike. one for the road, one for the trail, and one for the steeps seems plenty good for me. |
| i run something similar | hu-man
Nov 21, 2002 11:14 PM | | 36,32,22 up front and 14, 16 DX in the back with a derailleur set up as you describe. Works great. |
| thanks... i am going to | jh_on_the_cape
Nov 22, 2002 10:06 AM | | I ride 34:18 offroad. I got a 18 and a *titanium* 16 cog from the LBS. So I am going to set up 34 and 36 up front, and 16 and 18 in the back. so 36:16 for the road. It's what I got! I am not sure if I will be able to tell the difference or not, though...
I am hoping I can do the spot ring guard, and the two rings up front with the current chainring bolts that I have...
Thanks again for all the input. |
| re: 2 cogs on freehub for roadride to trailhead? | Pedsrfski
Nov 24, 2002 2:46 PM | | put the 36 back on the front and leave well enough alone. i ride 18 miles roundtrip to trail o tears and back on the road on my 36-18 and it's only 35 minutes each way. nice warm up and cool down. you gotta phd, figure it out! built another mile of trail at tot today-lots a hills. check it out! that brings the loop up to 21 miles without doing anything twice and nothing but singletrack, not including the trails across the street in sandwich. sat am 730. heading to d.c. tonight to do some riding-back friday.
keep it simple
roger |
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